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Re: Wood: 'en' and Plywood question.

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In a message dated 7/15/99 6:41:04 PM Pacific Daylight Time, 
quinnair(--nospam--at) writes:

<< My point was that in a multitude of racking tests, I never observed a nail
 to fail in shear.  The nails pull out, while flexing back and forth.  The
 holes in the sheathing wallow.  Nail heads pull through the sheathing.  But
 I have never seen a nail fail in shear under the racking condition.  Maybe
 if the sheathing were a steel plate?
 Pat Quinn
 Henderson, NV >>

I would agree that it is rare to see failure in the bolt when the material 
most likely to yield will be the weakest - ie, wood. Therefore, the problems 
associated to nail bending, besides affecting shearwall deflection can 
contribute (with all other terms under consideration) to a walls failure by 
tearing the head of the nail through the panel edge. APA has plenty of 
photo's showing nail deformation (bending) at the point of failure (at 
ultimate load). 

I lost track of the question that led to your response. Therefore, if this 
comment is not relevant, please let me know what your point refers to.